TY - JOUR T1 - Determination of benzene, toluene, ethylbenzene, xylenes in water at sub-ng l-1 levels by solid-phase microextraction coupled to cryo-trap gas chromatography-mass spectrometry. AU - Lee,Maw-Rong, AU - Chang,Chia-Min, AU - Dou,Jianpeng, Y1 - 2007/06/19/ PY - 2006/12/26/received PY - 2007/05/01/revised PY - 2007/05/03/accepted PY - 2007/6/22/pubmed PY - 2008/1/8/medline PY - 2007/6/22/entrez SP - 1381 EP - 7 JF - Chemosphere JO - Chemosphere VL - 69 IS - 9 N2 - A trace analytical method of benzene, toluene, ethylbenzene and xylenes (BTEX) in water has been developed by using headspace solid-phase microextraction (HS-SPME) coupled to cryo-trap gas chromatography-mass spectrometry (GC-MS). The chromatographic peak shape for BTEX was improved by using cryo-trap equipment. The HS-SPME experimental procedures to extract BTEX from water were optimized with a 75 microm carboxen/polydimethylsiloxane (CAR/PDMS)-coated fiber at a sodium chloride concentration of 267 g l(-1), extraction for 15 min at 25 degrees C and desorption at 290 degrees C for 2 min. Good linearity was verified in a range of 0.0001-50 microg l(-1) for each analyte (r(2)=0.996-0.999). The limits of detection (LODs) of BTEX in water reached at sub-ng l(-1) levels. LODs of benzene, toluene, ethylbenzene, m/p-xylene and o-xylene were 0.04, 0.02, 0.05, 0.01 and 0.02 ng l(-1), respectively. The proposed analytical method was successfully used for the quantification of trace BTEX in ground water. The results indicate that HS-SPME coupled to cryo-trap GC-MS is an effective tool for analysis of BTEX in water samples at the sub-ng l(-1) level. SN - 0045-6535 UR - https://www.unboundmedicine.com/medline/citation/17582460/Determination_of_benzene_toluene_ethylbenzene_xylenes_in_water_at_sub_ng_l_1_levels_by_solid_phase_microextraction_coupled_to_cryo_trap_gas_chromatography_mass_spectrometry_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(07)00615-7 DB - PRIME DP - Unbound Medicine ER -